<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    * {
      box-sizing: border-box;
    }
/* 
    html {
      position: fixed;
      width: 100%;
      height: 100%;
      display: flex;
      background: #fff;
      align-items: center;
      justify-content: center;
    } */

    body {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      margin: 0;
      padding: 0;
    }
  </style>
</head>

<body>

</body>

</html>